REANA-Workflow-Controller 0.6.0

• Modifies the batch workflow run creation, including an instance of
  REANA-Job-Controller running alongside with the workflow engine (sidecar
  pattern). Only DB and workflow worksapce are mounted.
• Refactors volume mounts using reana-commons base.
• Provides user secrets to the job controller.
• Extends workflow APIs for GitLab integration.
• Allows stream file uploads.